SSC JE Civil Engineering 23-Mar-2021 Shift 1 Paper

Concepts:
The principal mechanical properties of the structural steel important in design, as detailed by the code IS 800:2007 in cl. 2.2.4.2, are:
1. Yield stress
2. Tensile or ultimate stress
3.The maximum percent elongation on a standard gauge length and
4. Notch toughness
Note:
The various Physical properties of structural steel irrespective of its grade, as detailed by cl.2.2.4.1 of IS 800:2007 are:
1. Unit weight of steel $=7850\mathrm{kg}∕{\mathrm{m}}^3$
2. Modulus of elasticity, $\mathrm{E}=2.0\times {10}^5\mathrm{N}∕{\mathrm{mm}}^2$
3. Poisson ratio, $\mathrm{\mu }=0.3$
4. Modulus of rigidity, $\mathrm{G}=0.769\times {10}^5\mathrm{N}∕{\mathrm{mm}}^2$
5. Coefficient of thermal expansion $\mathrm{\alpha }=12\times {10}^{-6∕\mathrm{C}}$.